Mitsubishi Ecodan Heat Pump Review: The Safe Choice?
The UK’s most-installed heat pump — proven Japanese engineering, efficient, and easy to get serviced anywhere. The honest verdict on price, R32 vs R290, and the 3-year warranty catch most buyers miss.
The short answer
The Mitsubishi Ecodan is the UK’s most-installed heat pump, and it earns that position. Japanese-engineered by Mitsubishi Electric and sold in Britain since 2007, it offers proven reliability (longevity often cited near 20 years), solid efficiency (SCOP 3.4–4.3), strong cold-weather performance (Zubadan models work to −20°C), low noise, and — its biggest practical edge — the largest installer, engineer and parts network of any brand, so servicing is effortless. After the £7,500 grant it lands at £1,500–£6,500 net.
The honest catch every buyer should know: the standard warranty is just 3 years, extending to 5–7 only if you use an Accredited installer and maintain annual servicing — easy to overlook and important to get right. On pure efficiency, premium rivals like NIBE edge it on paper. But for most homes wanting a proven, reliable, endlessly-supportable heat pump, the Ecodan is the sensible default. We score it 4.3/5. Full review — R32 vs R290, the warranty small print, and the rivals — below.
What this review covers
This is our second brand heat pump review, and where the Ideal is the value-focused British option, the Mitsubishi Ecodan is the proven market leader — the pump more UK homes get than any other. Here’s the honest account of why it’s so popular, what it costs, the R32-versus-R290 decision, and the warranty detail that catches people out.
The brand and the Ecodan range
Mitsubishi Electric is a Japanese engineering giant (founded 1921, UK division since 1978), and its Ecodan range of air source heat pumps has been warming British homes since 2007 — giving it one of the longest UK track records in the business, and the status of the country’s most-installed heat pump brand (MCS, 2026). The Ecodan isn’t a single product but a family of air-to-water heat pumps (the type that replaces a boiler and heats your radiators and hot water — not to be confused with Mitsubishi’s separate air-to-air/air-conditioning range). It spans 5kW to 16kW, covering flats to large detached homes, in several variants: standard monobloc, integrated-tank, and split systems, plus specialist models like the Ultra Quiet (45dB), the cold-climate Zubadan, and space-saving Compact units. The most-installed single model is the 8.5kW PUZ-WM85VAA. Two refrigerant generations run in parallel — established R32 and newer R290 — which is the key buying decision, covered below.
What’s genuinely good
The network — its biggest asset. As the UK’s most-installed brand, the Ecodan has an installer, engineer, parts and service network no rival matches — finding someone to fit, service or repair one is genuinely easy anywhere in the country, which matters enormously over a 20-year system life. Proven reliability. A long UK track record and cited longevity around 20 years — this is well-understood, dependable kit, not a newcomer. Efficiency. SCOP ratings of 3.4–4.3 across the range (the R290 achieving real-world COP figures of 4.0–4.5), delivering 320–460% efficiency versus a gas boiler’s ~94%. Cold-weather strength. The Zubadan technology maintains heating capacity down to −20°C — a genuine advantage in a British winter. Low noise. The Ultra Quiet models run at just 45dB, quiet enough to sit comfortably within permitted-development noise limits (usually meaning no planning permission). Smart control. The MELCloud app enables smart-tariff scheduling — useful for running the pump on cheap overnight electricity. It’s a deeply sorted, dependable package.
Real cost: £1,500–£6,500 after the grant
| Item | Typical figure |
|---|---|
| Full installation (gross) | £9,000–£13,500 |
| Boiler Upgrade Scheme grant | −£7,500 |
| Net cost to you | £1,500–£6,500 |
| Unit only (vs £8k+ for Vaillant/NIBE) | £3,800–£5,800 |
| Annual service (maintains warranty) | £150–£300 |
| Efficiency (SCOP) | 3.4–4.3 |
A full Ecodan installation — unit, cylinder and labour — typically runs £9,000–£13,500 gross, dropping to £1,500–£6,500 net after the £7,500 Boiler Upgrade Scheme grant (around £4,500 is a common average). There’s a value angle worth noting even within the premium tier: the Ecodan unit itself is relatively affordable (£3,800–£5,800) compared with premium rivals like Vaillant or NIBE, where the unit alone can top £8,000 — so you get market-leading support without quite the top-tier price. The BUS grant needs an MCS-certified installer and a valid EPC with no outstanding insulation recommendations. Running costs depend heavily on your insulation and tariff — and, as we cover below, pairing the Ecodan with solar panels cuts them further. (For the wider funding picture, see our solar grants guide.)
R32 vs R290: which Ecodan to buy
The Ecodan comes in two refrigerant generations, and for a new install in 2026 the R290 range (PUZ-WZ) is generally the one to choose — though R32 remains strong and proven. R32 is the established refrigerant across most of the range, powering the Ultra Quiet, Zubadan and Compact models; it reaches flow temperatures around 60°C, which suits most homes but may mean upgrading older radiators. The newer R290 uses propane — a natural, very-low-impact refrigerant — and its practical advantage is reaching much higher flow temperatures (up to 75°C), making it far better for retrofits keeping existing radiators. The trade-offs: R290 units are larger and heavier (extra safety housing for the propane) and need specific clearances from windows and drains. Since Mitsubishi is gradually phasing out R32 in favour of R290, the R290 is also more future-proof. For most new installs — especially retrofits keeping existing rads — R290 is the sensible pick, but your installer will confirm the right model for your home and space.
The efficiency reality: the number depends on your install, not just the badge
One honest point on efficiency, because it’s where heat-pump marketing often misleads. The Ecodan’s headline SCOP of 3.4–4.3 is real, but the figure you actually get depends heavily on how the system is designed and run. Independent UK testing shows the same Ecodan model achieving around 2.9–3.2 when run at higher flow temperatures, but 4.0–4.4 when run at lower flow temperatures in a well-insulated home with correctly-sized radiators. That’s a huge real-world difference driven by the quality of the installation and your home’s fabric, not the brand on the box. The lesson applies to every heat pump, but it’s worth stating here: to get the efficiency you’re paying for, insulate well, size the radiators generously so the pump can run at a low flow temperature, and use a good installer who designs for low-temperature operation. A brilliantly-installed Ecodan outperforms a carelessly-installed premium rival every time.
The catch: that 3-year warranty
Here’s the single most important piece of small print in an Ecodan purchase, and the one most buyers miss: the standard warranty is only 3 years. To get the 5- or even 7-year cover most people assume comes as standard, you must use an Accredited Installer or Business Solutions Partner (Mitsubishi’s certified installer tiers) and maintain annual servicing throughout. Use a non-accredited installer, or skip the annual service, and you can be left with just the 3-year base cover — short for a system you expect to run 20 years, and shorter than some rivals offer as standard. This isn’t a reason to avoid the Ecodan; it’s a reason to buy it correctly: specifically choose an Accredited or Business Solutions Partner installer (ask them to confirm it in writing), and budget for the £150–£300 annual service that both preserves the warranty and keeps the pump running efficiently. Get this right and you have long cover and a well-maintained system; overlook it and you could unknowingly end up with minimal protection. It’s the easiest mistake to make with an Ecodan, and the easiest to avoid.
Ecodan vs Daikin vs Vaillant
The cluster’s most-asked comparisons, honestly. The Mitsubishi Ecodan wins on ubiquity and support — the most-installed UK brand, so installers, engineers, parts and servicing are easier to find than for anyone else, with a long proven track record and strong Zubadan cold-weather performance: the safe choice if reliability and easy servicing matter most. Daikin is another top-tier Japanese brand with excellent efficiency and reputation — Mitsubishi’s nearest equivalent, worth comparing directly. Vaillant’s aroTHERM (especially R290) tends to lead on headline efficiency and is an installer favourite for performance, usually at a higher unit price. And on pure efficiency figures, specialist NIBE (headline SCOP ~5.0) edges all three. The rule: market-leader reassurance and unbeatable support → Ecodan; cutting-edge efficiency → Vaillant or NIBE; Daikin → compare closely as Mitsubishi’s peer. For most UK homes, the Ecodan’s blend of proven reliability, good efficiency and effortless support makes it the sensible default — which is precisely why it’s installed more than any other. Where the Ideal undercuts it on price as the value British option, the Ecodan justifies its premium on the strength of that network and track record.
Pairing the Ecodan with solar
Like any heat pump, an Ecodan roughly doubles your home’s electricity use (heating is now electric), which is exactly why pairing it with solar panels makes so much sense: solar offsets a large share of that new demand, turning the pump’s efficiency into real bill savings. The Ecodan is well-suited to this because its MELCloud app supports smart-tariff scheduling — so you can run it on cheap overnight electricity via Intelligent Octopus Go and free daytime solar, the classic cheap all-electric setup. There’s an EPC bonus too — a fully-electric home with solar sees a bigger rating uplift. The honest caveat we always give applies here: solar covers most of a heat pump’s shoulder-season demand but little of its winter peak, so the tariff does the heavy lifting in January. Plan the two together — ideally sizing the solar and battery around the heat pump’s demand — and the Ecodan becomes the heating half of a genuinely cheap, low-carbon, all-electric home.
Our score: 4.3 / 5
Mitsubishi Ecodan — the proven, well-supported safe choice
The bottom line: The Ecodan is the UK’s most-installed heat pump for good reasons — proven Japanese reliability, solid efficiency, strong cold-weather performance, low noise, and an unmatched installer and parts network that makes ownership easy. After the grant it’s competitively priced within the premium tier. Just buy it right: use an Accredited installer to unlock the 5–7 year warranty (the standard 3 years is the catch), keep up the annual service, and insist on a low-flow-temperature design to get the efficiency you’re paying for. Especially good paired with solar.
Get my free quotes →Mitsubishi Ecodan: pros & cons
✓ Pros
- UK’s most-installed brand — easy to service anywhere
- Proven reliability, ~20-year longevity
- Strong efficiency (SCOP 3.4–4.3)
- Excellent cold-weather performance (Zubadan to −20°C)
- Low noise (Ultra Quiet 45dB — usually no planning)
- Relatively affordable unit within the premium tier
✗ Cons
- Only 3-year standard warranty (5–7 needs Accredited installer)
- Annual service required to keep extended warranty
- Pricier than budget brands (Samsung, Panasonic, LG)
- NIBE & Samsung R290 edge it on headline efficiency
- R32 max flow 60°C — older rads may need upgrading
- Monobloc-focused — some installers prefer split systems
Frequently asked questions
Are Mitsubishi heat pumps any good?
Yes — the Ecodan is the UK’s most-installed heat pump, proven since 2007, with strong reliability, efficiency (SCOP 3.4–4.3), cold-weather performance and an unmatched installer/parts network. The one catch: the standard warranty is just 3 years (5–7 with an Accredited installer). We score it 4.3/5.
How much does an Ecodan cost?
£9,000–£13,500 installed, dropping to £1,500–£6,500 after the £7,500 BUS grant (~£4,500 average net). The unit itself (£3,800–£5,800) is relatively affordable versus Vaillant/NIBE (£8,000+). Needs an MCS-certified installer for the grant.
R32 or R290?
R290 (PUZ-WZ) for most new installs — propane refrigerant, higher flow temps (75°C, better for existing radiators), more future-proof as Mitsubishi phases out R32. R32 is proven and reaches ~60°C. R290 units are bigger and need clearances. Your installer advises.
What’s the warranty catch?
Standard cover is only 3 years. To get 5–7 years you must use an Accredited or Business Solutions Partner installer AND maintain annual servicing (£150–£300/yr). Choose an accredited installer and confirm the warranty term in writing — it’s the easiest Ecodan mistake to make.
Ecodan, Daikin or Vaillant?
Ecodan for market-leader reliability and unbeatable support; Daikin as its closest Japanese peer; Vaillant (or NIBE) for cutting-edge efficiency at a higher price. All excellent — the Ecodan is the safe default thanks to its network and track record.
Is it air-to-air or air-to-water?
Air-to-water — the type that replaces a boiler and heats your radiators and hot water, eligible for the £7,500 grant. Mitsubishi’s separate air-to-air range is essentially air conditioning (heats air directly, no hot water, only the smaller £2,500 grant). This review covers the air-to-water Ecodan.
The verdict
The Mitsubishi Ecodan is the UK’s most-installed heat pump for reasons that hold up to scrutiny: it’s proven, efficient, quiet, strong in the cold, and — above all — supported by an installer and parts network no competitor can match. For a technology you’ll live with for two decades, that ease of servicing and repair is worth a great deal, and it’s the quiet reason the Ecodan is so often the installer’s default recommendation. Within the premium tier it’s also relatively affordable, and after the £7,500 grant the net cost is genuinely competitive.
The honesty this review adds is the warranty: the 3-year standard cover is a real catch, and unlocking the longer warranty means choosing an Accredited installer and keeping up the annual service — get that right and the Ecodan is close to faultless as a sensible, safe choice. Where it gets genuinely exciting is the pairing this site is built around: an Ecodan and solar together are the all-electric home, each making the other cheaper to run. If you’re heading that way, plan the solar around the heating demand — a couple of free, no-obligation quotes from MCS-certified solar installers will size an array and battery properly for a heat-pump home, so your Ecodan runs on as much sunshine and cheap-rate power as possible.
Important
Going Solar UK is an introduction service specialising in solar; we are not a heat pump installer, manufacturer or financial adviser, and heat pump installation is arranged separately through MCS-certified heat pump installers. This review reflects publicly available specifications, pricing and warranty terms as of August 2026: models, prices, SCOP figures, warranty conditions and grant terms change – always confirm current details with Mitsubishi Electric or your installer, confirm your warranty term and installer accreditation in writing, and check Boiler Upgrade Scheme eligibility at gov.uk, before purchase. Scores are our honest editorial opinion. Going Solar UK has no commercial relationship with Mitsubishi Electric.
We may receive a commission when we introduce you to an installer, at no cost to you. Any contract for work is directly between you and the installer.